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400.9×5用简便方法算

400.9×5 =(400.9/2)×(5x2) =200.45x10 =2004.5

76÷(400÷9) =76÷400×9 =76×9÷400 =684÷400 =1.71

632.5-400.9+99.6 =632.5-400+100-0.9-0.4 =332.5-1.3 =331.2

400/9.8=4000/98=2000/49=200/4.9

ni da ye

400乘9.5乘6.6 =400X10X6.6-400X 0.5X 6.6 =26400-1320 =25080

简便计算 9除于2.5除于400 9÷2.5÷400 =9÷(2.5×400) =9÷1000 =0.009.

里面的40是不是打少东西了 393+40+397+398+405+401+400+399+391+402 =400-7+40+400-3+400-2+400+5+400+1+400+400-1+400-9+400+2 =40+9*400-7-3-2-9-1+5+1+2 =3600+26 =3626 验证过

400×5÷(4+9)×5=2000÷9×5=111119(米)

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